Instruction 15-14
Recent Studies Have Found That Australian Children Are

question 67

Multiple Choice

Instruction 15-14
Recent studies have found that Australian children are more obese than in the past. The amount of time children spent watching television has received much of the blame. A survey of 100 ten-year-olds revealed the following with regards to weights and average number of hours a day spent watching television. You are interested in testing whether the average number of hours spent watching TV and weights are independent at 1% level of significance.
| TV Hours |
$$\begin{array} { | l | c | c | c | c | } \hline \text { Weights } & 0 - 3 & 3 - 6 & 6 + & \text { Total } \\\hline \text { More than 10 kg overweight } & 1 & 9 & 20 & 30 \\\hline \text { Within 10 kg of normal weight } & 20 & 15 & 15 & 50 \\\hline \text { More than 10 kg underweight } & 10 & 5 & 5 & 20 \\\hline \text { Total } & 31 & 29 & 40 & 100 \\\hline\end{array}$$
-Referring to Instruction 15-14,how many children in the survey spend more than 6 hours watching TV and are more than 10 kg overweight?

• A) 9
• B) 40
• C) 1
• D) 20

---

Definitions:

Potentiometer

A three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider.

Natchez Indian Society

A historical Native American society known for their complex social structure and the mounds they built in what is now the southeastern United States.

Supernatural Forces

Entities or powers beyond the natural world, often believed to influence human affairs in ways that are beyond scientific explanation or understanding.

Societal Structures

The organized patterns of social relationships and social institutions that together constitute society.